\documentclass[UTF8, 11pt, oneside]{ctexbook}
\input{czds2-styles}
\input{czds2-symbols}
\input{czds2-tikz-snippets}

\begin{document}

\include{czds2-title-page}

\frontmatter
\include{units/czds2-explanation}

\tableofcontents
\thispagestyle{empty}

\mainmatter
\setcounter{chapter}{4}
\setcounter{cntfuxiti}{4}
\include{units/czds2-ch5}
\include{units/czds2-ch6}
\include{units/czds2-ch7}
\include{units/czds2-ch8}

\end{document}
